Lens apparatus and image pickup apparatus

Abstract

To provide a lens device capable of suppressing deterioration of optical performance as compared with a conventional lens device.SOLUTION: The lens device includes a rotary barrel having a spiral cam groove, a first lens frame that holds a first lens, a movable barrel that has a first engagement member engaging with the cam groove and holds the first lens frame, and a fixed barrel that supports the movable barrel to be movable along a direction of an optical axis. The rotary barrel includes a first facing portion, and the movable barrel includes a second facing portion facing the first facing portion with a first gap in the direction of the optical axis. The first engagement member has a first elastic region, and the first gap is a gap corresponding to the first elastic region.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a lens device and an imaging device. [Background technology]

[0002] Patent Document 1 discloses an optical device comprising: an extension barrel that moves back and forth in the optical axis direction; a cam barrel that has a cam follower provided on the extension barrel, a cam groove that engages with the cam follower, and a protrusion that protrudes outward, and is rotatable around the optical axis; a frame member that covers the tip of the extension barrel and part of the outer periphery of the cam barrel and moves back and forth in the optical axis direction integrally with the extension barrel; an elastic member that urges the extension barrel and the frame member to move apart from each other in the optical axis direction; and a regulating member that maintains a state in which a first gap is formed between the extension barrel and the frame member in the optical axis direction; the frame member has a recess on its inner periphery that faces the protrusion in the radial direction, and a second gap formed between the protrusion and the recess in the optical axis direction is smaller than the first gap.

[0003] Patent Document 2 describes a zoom lens barrel in which the lens moves in the direction of the optical axis between a storage position and a shooting position to change the shooting magnification, and includes a fixed barrel having a plurality of first protrusions or follower portions on its outer periphery and a flange portion on the outer periphery of the end on the subject side, a stopper member that is fixedly disposed substantially coaxially with the fixed barrel and has a plurality of second protrusions or follower portions on its outer periphery, each having a flank surface on both sides in the optical axis direction, and a plurality of first cam grooves that are disposed on the outer periphery of the fixed barrel and the stopper member and that cam engage with the plurality of first protrusions or follower portions on their inner periphery, and The lens barrel is provided with a cam barrel in which a plurality of second cam grooves are formed on the same trajectory as the first cam groove, with each of the plurality of second protrusions or follower portions engaging with the first cam groove, at positions away from the groove on the image surface side in the optical axis direction, and which moves in the optical axis direction while rotating relative to the fixed barrel and the stopper member due to the engagement between the first protrusions or follower portions and the first cam grooves, and the engagement between the second protrusions or follower portions and the second cam grooves, and in which, in a region where the cam barrel extends toward the subject and approaches a flange portion of the fixed barrel, the side walls on the image surface side of the plurality of second cam grooves, with each of the plurality of second protrusions or follower portions engaging with the second cam grooves, are open.

[0004] Patent Document 3 discloses a lens barrel that includes a cylindrical movable part that holds at least one lens, is located closest to the subject, and has a flange-shaped part on the subject side that is movable forward and backward in the optical axis direction; a cam ring that drives the movable part so that it can move forward and backward in the optical axis direction and is located radially inside the movable part; a fixed sensor holding member that is located on the imaging surface side of the movable part and radially outside the cam ring and is equipped with a sensor for detecting rotation of the cam ring; a reflecting member holding frame that is located radially outside the sensor holding member and is equipped with a reflecting member for detecting position using the sensor and rotates integrally with the cam ring; a fixed first exterior member that is located outside the reflecting member; and a second exterior member that is located on the subject side of the first exterior member and is connected and fixed to the first exterior member; when an impact is applied to the subject-side end face of the cylindrical movable part, the imaging surface side surface of the flange-shaped part hits the second exterior member, and the force of the impact is transmitted to the first exterior member via the second exterior member.

[0005] Patent Document 4 discloses a lens barrel comprising a first cylindrical member having a cam groove and arranged to be rotatable around an axis passing through the radial center as the central axis of rotation, and a second cylindrical member having a cam follower that engages with the cam groove, holding an optical element and being able to move back and forth in the optical axis direction of the optical element in accordance with the rotation of the first cylindrical member, wherein the first cylindrical member has a hole portion, and the second cylindrical member has a stopper member that moves back and forth relative to the hole portion in accordance with the movement of the second cylindrical member in the optical axis direction, and the hole portion has an abutment wall that can abut against the stopper member in the optical axis direction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-179474 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-048283 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-128852 [Patent Document 4] Japanese Patent Application Publication No. 2019-113677 Summary of the Invention

[0007] One embodiment of the technique of the present disclosure provides a lens device that can suppress a decrease in optical performance compared to conventional devices. [Means for solving the problem]

[0008] A first aspect of the technology of the present disclosure is a lens device comprising: a rotating barrel having a spiral cam groove; a first lens frame that holds a first lens; a movable barrel having a first engagement member that engages with the cam groove and holds the first lens frame; and a fixed barrel that supports the movable barrel movably along the optical axis direction, wherein the rotating barrel has a first opposing portion, the movable barrel has a second opposing portion that faces the first opposing portion with a first gap in the optical axis direction, the first engagement member has a first elastic region, and the first gap is a gap corresponding to the first elastic region.

[0009] A second aspect of the technology according to the present disclosure is a lens device according to the first aspect, in which, for the amount of deformation of the first engaging member in the direction of the optical axis measured such that the amount of deformation corresponding to the yield point of the first engaging member is A [mm], and the dimension of the first gap in the direction of the optical axis is B [mm], the following formula (1) is satisfied: B < A ··· (1).

[0010] A third aspect of the technology according to the present disclosure is a lens device according to the second aspect, in which the following formula (2) is satisfied: A × 0.7 ≤ B < A ··· (2).

[0011] A fourth aspect of the technology according to the present disclosure is a lens device according to the third aspect, in which B = 0.050 mm.

[0012] A fifth aspect of the technology according to the present disclosure is a lens device according to any one of the first to fourth aspects, in which the first gap is a gap at which the second opposing portion abuts against the first opposing portion before the first engaging member plastically deforms beyond the first elastic region.

[0013] A sixth aspect of the technology according to the present disclosure is a lens device according to any one of the first to fifth aspects, in which the first engaging member is a roller of a cam follower.

[0014] A seventh aspect of the technology according to the present disclosure is a lens device according to any one of the first to sixth aspects, in which the material of the first engaging member is a material including resin, rubber, or elastomer.

[0015] An eighth aspect of the technology according to the present disclosure is a lens device according to any one of the first to seventh aspects, in which the first engaging member is a roller of a cam follower selected according to the dimension of the width of the cam groove.

[0016] A ninth aspect of the technique of the present disclosure is a lens device according to any one of the first to eighth aspects, wherein the first opposing portion is formed on a side wall portion of the cam groove.

[0017] A tenth aspect of the technique of the present disclosure is the lens device according to the ninth aspect, wherein the second opposing portion is located on the subject side of the side wall portion in the direction of the optical axis.

[0018] An eleventh aspect of the technology of the present disclosure is a lens device according to any one of the first to tenth aspects, wherein at least a portion of the second opposing portion overlaps with at least a portion of the first engaging member when viewed from the direction of the optical axis.

[0019] A twelfth aspect of the technology of the present disclosure is a lens device according to any one of the first to eleventh aspects, wherein the movable barrel has a plurality of first engaging members and a plurality of second opposing portions, and each second opposing portion is provided at a position corresponding to each first engaging member.

[0020] A thirteenth aspect of the technique of the present disclosure is the lens device according to the twelfth aspect, in which the number of the second opposing portions is the same as the number of the first engaging members.

[0021] A fourteenth aspect of the technique of the present disclosure is a lens device according to any one of the first to thirteenth aspects, wherein the rotating barrel has a cam barrel having a cam groove and a connecting barrel arranged on the imaging side relative to the cam barrel, the imaging side end of the movable barrel is located radially outside the cam barrel, and the second opposing portion is provided in a convex shape on the inner surface of the end.

[0022] A fifteenth aspect of the technology of the present disclosure is a lens device according to any one of the first to fourteenth aspects, wherein the fixed barrel has a straight groove along the direction of the optical axis, the movable barrel has a second engagement member that engages with the straight groove, and the second engagement member is positioned between the center of gravity of the first lens and the first engagement member in the direction of the optical axis.

[0023] A sixteenth aspect of the technology of the present disclosure is a lens device according to any one of the first to fifteenth aspects, wherein the rotating barrel has a cam barrel having a cam groove and a connecting barrel arranged on the imaging side of the cam barrel, and the connecting barrel is configured separately from the cam barrel and connected to the cam barrel.

[0024] A seventeenth aspect of the technique of the present disclosure is the lens device according to the sixteenth aspect, wherein the connecting cylinder has a gear portion that engages with the drive portion.

[0025] An eighteenth aspect according to the technique of the present disclosure is the lens device according to the seventeenth aspect, wherein the gear portion is formed at an end of the connecting tube on the image-forming side.

[0026] A 19th aspect of the technology of the present disclosure is a lens device according to any one of the 16th to 18th aspects, in which the connecting tube has a shape that increases in diameter as it approaches the image-forming side.

[0027] A 20th aspect of the technology of the present disclosure is a lens device according to any one of the 16th to 19th aspects, in which the outer diameter of the image-side end of the connecting tube is larger than the outer diameter of the cam tube.

[0028] A 21st aspect of the technology of the present disclosure is a lens device according to any one of the 16th to 20th aspects, which is provided with a second lens frame that holds a second lens, the second lens having a third lens positioned radially inside the cam tube and a fourth lens positioned radially inside the connecting tube, and the outer diameter of the fourth lens is larger than the outer diameter of the third lens.

[0029] A twenty-second aspect according to the technique of the present disclosure is the lens device according to any one of the sixteenth to twenty-first aspects, in which the material of the cam barrel is a material containing metal.

[0030] A 23rd aspect of the technology of the present disclosure is a lens device according to any one of the first to 22nd aspects, which includes a second lens frame that holds a second lens, the rotating barrel having a support groove along a direction around the optical axis, the fixed barrel having a third engaging member that engages with the support groove, the rotating barrel having a third opposing portion, the second lens frame having a fourth opposing portion that faces the third opposing portion with a second gap in the direction of the optical axis, the third engaging member having a second elastic region, and the second gap being a gap corresponding to the second elastic region.

[0031] A 24th aspect of the technique of the present disclosure is the lens device according to the 23rd aspect, wherein the second gap is a gap corresponding to the first gap.

[0032] A 25th aspect of the technology of the present disclosure is a lens device according to the 23rd or 24th aspect, wherein the second lens frame has a fixed portion that is fixed to the imaging device body, and at least a portion of the fourth opposing portion overlaps with at least a portion of the fixed portion in the direction around the optical axis.

[0033] A 26th aspect of the technology of the present disclosure is a lens device according to any one of the 23rd to 25th aspects, wherein the fixed tube has a plurality of third engaging members, the second lens frame has a plurality of fourth opposing portions, and at least one of the plurality of fourth opposing portions is provided at a position corresponding to at least one of the plurality of third engaging members.

[0034] A 27th aspect of the technology of the present disclosure is a lens device according to any one of the 23rd to 26th aspects, wherein the movable barrel has a plurality of second opposing portions, the second lens frame has a plurality of fourth opposing portions, and at least one of the plurality of fourth opposing portions is provided at a position corresponding to at least one of the plurality of second opposing portions.

[0035] A 28th aspect of the technique of the present disclosure is an imaging device including the lens device according to any one of the first to 27th aspects. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a perspective view of an imaging device according to an embodiment of the technology of the present disclosure. [Figure 2] FIG. 2 is a vertical cross-sectional view of the lens device. [Figure 3] FIG. 4 is a vertical cross-sectional view of the periphery of a linear roller member and a cam roller member. [Figure 4] FIG. 4 is a vertical cross-sectional view of the periphery of the support roller member. [Figure 5] 4 is a vertical cross-sectional view showing the positional relationship between the center of gravity of the first lens and the linear roller member. FIG. [Figure 6] FIG. 1 is a front view schematically illustrating an imaging device. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. 4 is a vertical cross-sectional view showing the positional relationship between a first impact force receiving portion and a cam roller member. [Figure 12] 10 is a diagram schematically showing the positional relationship between a first impact force receiving portion and a cam roller member. FIG. [Figure 13] FIG. 4 is a vertical cross-sectional view of the periphery of the first impact receiving portion. [Figure 14] 10 is a graph showing an example of the relationship between stress σ and strain ε for the material of the cam roller. [Figure 15] 10 is a plan view showing the positional relationship between the first impact force receiving portion and the side wall portion of the cam groove. FIG. [Figure 16] FIG. 4 is a vertical cross-sectional view of the periphery of a second impact receiving portion. [Figure 17] FIG. [Figure 18] 10 is a diagram schematically illustrating the positional relationship between a second impact receiving portion and a support roller member. FIG. [Figure 19] FIG. 2 is a perspective view of a second lens frame. [Figure 20] 4 is a diagram schematically showing the positional relationship between a first impact receiving portion and a second impact receiving portion. FIG. [Figure 21] 10A and 10B are diagrams schematically showing modified examples of the positional relationship between the first impact force receiving portion and the second impact force receiving portion. DETAILED DESCRIPTION OF THE INVENTION

[0037] An embodiment of the lens device 14 according to the technique of the present disclosure will be described below.

[0038] (Configuration of imaging device 10) 1, an imaging device 10 according to this embodiment includes an imaging device main body 12 and a lens device 14. An image sensor 16 is provided inside the imaging device main body 12. The lens device 14 is a device for focusing light on the light receiving surface of the image sensor 16, and is attached to the front surface of the imaging device main body 12. The lens device 14 may be an integrated type that is provided integrally with the imaging device main body 12, or an exchangeable type that is provided exchangeably with the imaging device main body 12.

[0039] The lens device 14 has an optical axis OA. Hereinafter, the direction of the optical axis OA (i.e., the direction along the optical axis OA) will be referred to as the "optical axis direction," and the direction around the optical axis OA centered on the optical axis OA will be referred to as the "direction around the optical axis." The arrow Z1 side indicates the subject side of the lens device 14, and the arrow Z2 side indicates the image side of the lens device 14.

[0040] (Configuration of lens device 14) 2, the lens device 14 includes a fixed barrel 18, a movable barrel 20, a rotating barrel 22, a first lens frame 24, a second lens frame 26, a first lens 28, a second lens 30, and a drive unit 32. The fixed barrel 18, the movable barrel 20, the rotating barrel 22, the first lens frame 24, and the second lens frame 26 are all formed in a cylindrical shape (in other words, annular) along the direction around the optical axis.

[0041] The fixed barrel 18 is disposed radially outward of the movable barrel 20 and the rotating barrel 22. An end 18A of the fixed barrel 18 on the image formation side is fixed to a fixed portion 34 provided on the front surface of the imaging device body 12. As will be described in detail later, the rotating barrel 22 has a cam barrel 36 and a connecting barrel 38. The cam barrel 36 is disposed on the subject side of the connecting barrel 38. The movable barrel 20 is disposed radially outward of the cam barrel 36. The movable barrel 20 is disposed on the subject side of the connecting barrel 38.

[0042] The first lens frame 24 is disposed radially inward of the movable barrel 20. The second lens frame 26 is disposed on the imaging side relative to the first lens frame 24. An end 26A of the second lens frame 26 on the imaging side is formed in a flange shape. The portion of the second lens frame 26 excluding the end 26A on the imaging side (i.e., the portion of the second lens frame 26 closer to the subject than the end 26A on the imaging side) is disposed radially inward of the rotating barrel 22.

[0043] The first lens 28 is disposed radially inside the first lens frame 24. The first lens 28 is held by the first lens frame 24. The first lens 28 includes a lens 28A, a lens 28B, a lens 28C, a lens 28D, and a lens 28E. The lenses 28A to 28E are disposed in this order from the subject side to the image side: lens 28A, lens 28B, lens 28C, lens 28D, and lens 28E.

[0044] The second lens 30 is disposed radially inside the second lens frame 26. The second lens 30 is held by the second lens frame 26. The second lens 30 is disposed on the subject side of the image sensor 16 and faces the image sensor 16 in the optical axis direction. The second lens 30 includes a lens 30A, a lens 30B, a lens 30C, a lens 30D, and a lens 30E. The lenses 30A to 30E are disposed in the following order from the subject side to the image side: lens 30A, lens 30B, lens 30C, lens 30D, and lens 30E. The outer diameters of the lenses 30A to 30D increase in the order of lens 30A, lens 30B, lens 30C, lens 30D, and lens 30E.

[0045] The connecting tube 38 has a shape that increases in diameter toward the imaging side. The outer diameter of the imaging side end 38A of the connecting tube 38 is larger than the outer diameter of the cam tube 36. The lenses 30A and 30B are located radially inside the cam tube 36. The lenses 30C, 30D, and 30E are located radially inside the connecting tube 38. The lenses 30A and 30B are an example of a "third lens" according to the technology of the present disclosure, and the lenses 30C, 30D, and 30E are an example of a "fourth lens" according to the technology of the present disclosure. The outer diameters of the lenses 30C, 30D, and 30E are larger than the outer diameters of the lenses 30A and 30B.

[0046] As shown in FIG. 3, the fixed barrel 18 has a rectilinear groove 40. The rectilinear groove 40 is formed on the inner circumferential surface of the fixed barrel 18. The rectilinear groove 40 extends linearly along the optical axis direction. Although one rectilinear groove 40 is shown in FIG. 3, the fixed barrel 18 has a plurality of rectilinear grooves 40. As an example, the number of the plurality of rectilinear grooves 40 is three. The plurality of rectilinear grooves 40 are formed at equal intervals in the circumferential direction of the fixed barrel 18.

[0047] The movable barrel 20 has a linear roller member 42. The linear roller member 42 is provided on the subject side of the end 20A of the movable barrel 20 on the imaging side. The linear roller member 42 has a shaft member 44 and a linear roller 46. The linear roller 46 is an example of a "second engagement member" according to the technology of the present disclosure. The shaft member 44 is provided along the radial direction of the movable barrel 20. The tip of the shaft member 44 protrudes from the outer peripheral surface of the movable barrel 20. A cam follower is provided at the tip of the shaft member 44, and the linear roller 46 is a roller of the cam follower. The linear roller 46 is rotatably supported at the tip of the shaft member 44.

[0048] The linear rollers 46 are engaged with the linear grooves 40. Although one linear roller member 42 is shown in FIG. 3, the movable barrel 20 has a plurality of linear roller members 42. As an example, the number of the linear roller members 42 is three. The plurality of linear roller members 42 are provided at equal intervals in the circumferential direction of the movable barrel 20. Each linear roller 46 is engaged with the linear groove 40 so as to be relatively movable. With the linear rollers 46 engaged with the linear grooves 40, the movable barrel 20 is supported by the fixed barrel 18 so as to be movable along the optical axis direction.

[0049] The linear roller 46 is made of an elastic material. The material of the linear roller 46 is, for example, a material containing resin, rubber, or elastomer. When assembling the lens device 14, a plurality of cam followers having different outer diameters are prepared, and a cam follower having a linear roller 46 that matches the width of the linear groove 40 is selected from the plurality of cam followers according to the width of the linear groove 40 (in other words, the dimensional error).

[0050] The cam barrel 36 has a cam groove 48. The cam groove 48 is formed on the outer peripheral surface of the cam barrel 36. The cam barrel 36 is formed in a spiral shape that spirals in a direction around the optical axis. The movable barrel 20 has a cam roller member 50. The cam roller member 50 is provided at the end 20A of the movable barrel 20 on the imaging side. The end 20A of the movable barrel 20 on the imaging side is located radially outward from the cam barrel 36. The cam roller member 50 has a shaft member 52 and a cam roller 54. The cam roller 54 is an example of a "first engagement member" according to the technology of the present disclosure. The shaft member 52 is provided along the radial direction of the movable barrel 20. The tip of the shaft member 52 protrudes from the inner peripheral surface of the movable barrel 20. A cam follower is provided at the tip of the shaft member 52, and the cam roller 54 is a roller of the cam follower. The cam roller 54 is rotatably supported at the tip end of the shaft member 52 .

[0051] The cam rollers 54 are engaged with the cam grooves 48. Although one cam roller member 50 is shown in FIG. 3, the movable barrel 20 has a plurality of cam roller members 50. As an example, the number of the cam roller members 50 is three. The plurality of cam roller members 50 are provided at equal intervals around the circumference of the movable barrel 20. Each cam roller 54 is engaged with a cam groove 48 so as to be relatively movable. The rotating barrel 22 including the cam barrel 36 is supported by the movable barrel 20 so as to be rotatable in a direction around the optical axis, with the cam rollers 54 engaged with the cam grooves 48.

[0052] The cam rollers 54 are made of an elastic material. The material of the cam rollers 54 is, for example, a material containing resin, rubber, or elastomer. When assembling the lens device 14, a plurality of cam followers having different outer diameters are prepared, and a cam follower having a cam roller 54 that matches the width of the cam groove 48 is selected from the plurality of cam followers according to the width of the cam groove 48 (in other words, the dimensional error).

[0053] As shown in FIG. 4 , the connecting barrel 38 has a support groove 56. The support groove 56 is formed on the outer peripheral surface of the image-side end 38A of the connecting barrel 38. The support groove 56 is formed in an arc-like or annular shape along the direction around the optical axis. The fixed barrel 18 has a support roller member 58. The support roller member 58 has a shaft member 60 and a support roller 62. The support roller 62 is an example of a "third engagement member" according to the technology of the present disclosure. The shaft member 60 is provided along the radial direction of the fixed barrel 18. The tip of the shaft member 60 protrudes from the inner peripheral surface of the fixed barrel 18. A cam follower is provided on the tip of the shaft member 60, and the support roller 62 is a roller of the cam follower. The support roller 62 is rotatably supported on the tip of the shaft member 60.

[0054] The support rollers 62 are engaged with the support grooves 56. Although one support roller member 58 is shown in FIG. 4, the fixed barrel 18 has a plurality of support roller members 58. As an example, the number of the plurality of support roller members 58 is three. The plurality of support roller members 58 are provided at equal intervals in the circumferential direction of the fixed barrel 18. Each support roller 62 is engaged with the support groove 56 so as to be relatively movable. With the support rollers 62 engaged with the support grooves 56, the rotating barrel 22 including the connecting barrel 38 is supported on the fixed barrel 18 so as to be rotatable in a direction around the optical axis.

[0055] The support rollers 62 are made of an elastic material. The material of the support rollers 62 is, for example, a material containing resin, rubber, or elastomer. When assembling the lens device 14, a plurality of cam followers having different outer diameters are prepared, and a cam follower having a support roller 62 that matches the width of the support groove 56 is selected from the plurality of cam followers according to the width of the support groove 56 (in other words, the dimensional error).

[0056] As shown in FIG. 3, the movable barrel 20 has a first impact receiving portion 64. The first impact receiving portion 64 is an example of a "second opposing portion" according to the technology of the present disclosure. The first impact receiving portion 64 is formed on the image-side end 20A of the movable barrel 20. As shown in FIG. 4, the second lens frame 26 has a second impact receiving portion 66. The second impact receiving portion 66 is an example of a "fourth opposing portion" according to the technology of the present disclosure. The second impact receiving portion 66 is formed on the image-side end 26A of the second lens frame 26. The first impact receiving portion 64 and the second impact receiving portion 66 are portions that receive impact when an impact is applied to the lens device 14, for example, when the imaging device 10 (see FIG. 1) is dropped. The first impact receiving portion 64 and the second impact receiving portion 66 will be described in detail later.

[0057] As shown in FIG. 5, the first lens 28 has a center of gravity 68. An imaginary line L1 is a line that passes through the center of gravity 68 of the first lens 28 in a side view of the lens device 14 and is perpendicular to the optical axis direction. An imaginary line L2 is a line that passes through the rotation axis of the rectilinear roller 46. An imaginary line L3 is a line that passes through the rotation axis of the cam roller 54. The rectilinear roller 46 is disposed between the position of the center of gravity 68 of the first lens 28 and the cam roller 54 in the optical axis direction. More specifically, the rectilinear roller 46 is disposed closer to the center of gravity 68 of the first lens 28 than the center between the position of the center of gravity 68 of the first lens 28 and the cam roller 54 in the optical axis direction.

[0058] As shown in FIG. 6, the imaging device body 12 includes a battery 70, a hot shoe microphone 72, a viewfinder 74, and a tripod mount 76. The battery 70 is provided on one side of the imaging device body 12 (for example, the right side). The hot shoe microphone 72 is provided on the top of the imaging device body 12. The viewfinder 74 is provided on the upper corner of the imaging device body 12 opposite the battery 70. The drive unit 32 is located on the lower corner of the imaging device body 12 opposite the battery 70. The tripod mount 76 is provided on the bottom of the imaging device body 12.

[0059] The driving device 32 is a motor actuator having a motor, a reduction mechanism, etc. The driving device 32 is an example of a "driving unit" according to the technology of the present disclosure. Examples of the motor used in the driving device 32 include a DC motor and a stepping motor.

[0060] The drive device 32 is a device for bidirectionally rotating the rotary barrel 22 (see FIGS. 2 to 4). When the rotary barrel 22 rotates, the cam rollers 54 move relatively within the cam grooves 48, converting the rotational motion of the rotary barrel 22 into linear motion of the movable barrel 20, which moves along the optical axis direction. The first lens frame 24 is fixed to the movable barrel 20 and moves integrally with the movable barrel 20. The second lens frame 26 is fixed to the fixed barrel 18.

[0061] The following describes in more detail the configurations of the above-mentioned rotating barrel 22, the first impact receiving portion 64, and the second impact receiving portion 66 in order.

[0062] (Configuration of the rotating barrel 22) As shown in FIG. 7, as explained above, the rotating barrel 22 has a cam barrel 36 having cam grooves 48, and a connecting barrel 38 arranged on the imaging side of the cam barrel 36. The connecting barrel 38 is configured separately from the cam barrel 36. The cam barrel 36 and the connecting barrel 38 are made of a material that contains metal. Examples of metals that can be used for the cam barrel 36 and the connecting barrel 38 include aluminum. In FIG. 8, the cam barrel 36 is shown alone.

[0063] The cam barrel 36 has a side wall portion 78 of the cam groove 48. The side wall portion 78 is an example of a "first opposing portion" according to the technology of the present disclosure. The side wall portion 78 is located on the subject side of the cam groove 48. The side wall portion 78 is formed from one end to the other end in the length direction of the cam groove 48 (i.e., the direction along the spiral). The cam groove 48 is formed, for example, by a bottomed groove.

[0064] The connecting tube 38 has a gear unit 80. The gear unit 80 is formed on the end 38A of the connecting tube 38 on the imaging side. The gear unit 80 is formed in an arc shape along the direction around the optical axis. A gear provided in the speed reduction mechanism of the drive device 32 (see FIG. 6) engages with the gear unit 80. When the motor of the drive device 32 rotates the gear, the rotating tube 22 rotates integrally with the gear unit 80.

[0065] 9, a first fitting portion 82 is formed at the end of the cam barrel 36 on the image side, and a second fitting portion 84 is formed at the end of the connecting barrel 38 on the subject side. The second fitting portion 84 fits into the first fitting portion 82, thereby connecting the connecting barrel 38 to the cam barrel 36.

[0066] (Configuration of the first impact receiving portion 64) 10, the first impact receiving portion 64 is formed on the inner circumferential surface of the end portion 20A on the imaging side of the movable barrel 20. The first impact receiving portion 64 is provided in a convex shape on the inner circumferential surface of the end portion 20A. In other words, the first impact receiving portion 64 is formed in a shape such that a portion of the inner circumferential surface of the end portion 20A bulges radially inward of the movable barrel 20. The first impact receiving portion 64 is located on the subject side of the cam roller 54.

[0067] 11, the first impact receiving portion 64 has a side surface 64A. The side surface 64A is an example of a "second opposing surface" according to the technology of the present disclosure. The side surface 64A is the surface on the image side of the first impact receiving portion 64. When viewed from the radial direction of the movable barrel 20, the side surface 64A is inclined with respect to a direction perpendicular to the optical axis direction.

[0068] 12, when the width direction of the first impact force receiving portion 64 is set to the direction along the circumferential direction of the movable barrel 20, at least a portion of the width direction of the first impact force receiving portion 64 overlaps with at least a portion of the cam roller 54 when viewed from the optical axis direction. In the present embodiment, as an example, a portion of the width direction of the first impact force receiving portion 64 overlaps with a portion of the cam roller 54 when viewed from the optical axis direction.

[0069] Note that the entire width of the first impact receiving portion 64 may overlap with the entire cam roller 54 when viewed from the optical axis direction, or the entire width of the first impact receiving portion 64 may overlap with a part of the cam roller 54 when viewed from the optical axis direction. Also, a part of the width of the first impact receiving portion 64 may overlap with the entire cam roller 54 when viewed from the optical axis direction.

[0070] As shown in FIG. 13 , the first impact receiving portion 64 faces the side wall portion 78 of the cam groove 48 with a first gap 86 in the optical axis direction. The cam barrel 36 rotates relative to the movable barrel 20. Therefore, the first gap 86 is provided between the movable barrel 20 and the cam barrel 36 to ensure rotation of the cam barrel 36. However, if the lens device 14 is impacted by, for example, dropping the imaging device 10, causing the movable barrel 20 to move toward the imaging side, the cam roller 54 may interfere with the imaging-side side surface of the cam groove 48, causing plastic deformation beyond its elastic range. If the cam roller 54 plastically deforms, the rotational accuracy of the cam barrel 36 and, ultimately, the linear movement accuracy of the movable barrel 20 may decrease, which may result in a deterioration in the optical performance of the lens device 14.

[0071] Therefore, the first gap 86 is set to a dimension that corresponds to the elastic range of the cam roller 54. In other words, the first gap 86 is set to a dimension that allows the first impact receiving portion 64 to abut against the side wall portion 78 of the cam groove 48 before the cam roller 54 exceeds the elastic range and undergoes plastic deformation.

[0072] Specifically, when the deformation amount of cam roller 54 in the optical axis direction (i.e., the deformation amount in the radial direction of cam roller 54) corresponding to the yield point of the material forming cam roller 54 is denoted as A [mm], and the dimension of first gap 86 in the optical axis direction is denoted as B [mm], dimension B [mm] of first gap 86 is set to a dimension that satisfies formula (1).More specifically, dimension B [mm] of first gap 86 is set to a dimension that satisfies formula (2). B <A···(1) A×0.7≦B <A···(2)

[0073] FIG. 14 shows an example of the relationship between stress σ and strain ε for the material of the cam roller 54. The deformation amount A is determined based on the maximum strain εmax corresponding to the yield point. The dimension B of the first gap 86 is, for example, 0.0050 mm. If the dimension B is less than the deformation amount A × 0.7 (i.e., 70% of the deformation amount A), there is a risk of interference with the movable barrel 20 during rotation of the cam barrel 36. On the other hand, if the dimension B is equal to or greater than the deformation amount A, when an impact is applied to the lens device 14, such as when the imaging device 10 is dropped, the cam roller 54 may undergo plastic deformation beyond its elastic range, thereby reducing the rotational accuracy of the cam barrel 36 and, ultimately, the linear movement accuracy of the movable barrel 20, and thus the optical performance of the lens device 14. The elastic range of the cam roller 54 is an example of a “first elastic range” according to the technology of the present disclosure.

[0074] 15, the side wall portion 78 of the cam groove 48 has a side surface 78A. The side surface 78A is an example of a "first opposing surface" according to the technology of the present disclosure. The side surface 78A is the surface of the side wall portion 78 facing the subject. The side surface 78A is formed along the spiral cam groove 48, and is therefore inclined relative to a direction perpendicular to the optical axis direction when viewed from the radial direction of the cam barrel 36.

[0075] The first impact receiving portion 64 is located on the opposite side of the side wall portion 78 from the cam roller 54 in the optical axis direction. In other words, the first impact receiving portion 64 is located on the subject side of the cam roller 54. As described above, the first impact receiving portion 64 has a side surface 64A (see also FIG. 11). The side surface 64A is the image-side surface of the first impact receiving portion 64. When viewed from the radial direction of the movable barrel 20, the side surface 64A is inclined with respect to a direction perpendicular to the optical axis direction. The inclination angle of the side surface 64A corresponds to the inclination angle of the side surface 78A of the side wall portion 78. The side surface 64A of the first impact receiving portion 64 faces the side surface 78A of the side wall portion 78 in the optical axis direction.

[0076] 13 and 15 show one first impact receiving portion 64, but the movable barrel 20 has a plurality of first impact receiving portions 64. The number of the plurality of first impact receiving portions 64 is the same as the number of the plurality of cam roller members 50. As an example, the number of the plurality of first impact receiving portions 64 is three. The plurality of first impact receiving portions 64 are formed at equal intervals in the circumferential direction of the movable barrel 20. Each first impact receiving portion 64 is provided at a position corresponding to each cam roller 54. In other words, as described above, at least a portion of each first impact receiving portion 64 in the width direction overlaps with at least a portion of each cam roller 54 when viewed from the optical axis direction (see FIGS. 11 and 12).

[0077] (Configuration of second impact receiving portion 66) As shown in FIG. 16, the second impact receiving portion 66 is formed on the subject-side surface of the image-side end 26A of the second lens frame 26. The second impact receiving portion 66 is formed in a convex shape that protrudes toward the subject from the subject-side surface of the end 26A. The second impact receiving portion 66 is located on the image-side relative to the support roller 62. A convex portion 88 (see also FIG. 17) that protrudes toward the image side is formed on the image-side surface of the image-side end 38A of the connecting tube 38. The convex portion 88 is an example of a "third opposing portion" according to the technology of the present disclosure. The convex portion 88 is formed in an annular shape along the circumferential direction of the connecting tube 38.

[0078] The second impact receiving portion 66 faces the convex portion 88 with a second gap 90 in the optical axis direction. The connecting barrel 38 rotates relative to the second lens frame 26. Therefore, the second gap 90 is provided between the connecting barrel 38 and the second lens frame 26 to ensure rotation of the connecting barrel 38. However, if the movable barrel 20 and the rotatable barrel 22 move toward the imaging side due to an impact being applied to the lens device 14, such as when the imaging device 10 is dropped, the support rollers 62 may interfere with the imaging side surface of the support groove 56, causing them to plastically deform beyond their elastic range. If the support rollers 62 plastically deform, the rotational accuracy of the cam barrel 36 (see FIG. 2) connected to the connecting barrel 38 and, ultimately, the linear movement accuracy of the movable barrel 20 (see FIG. 2) may decrease, resulting in a deterioration in the optical performance of the lens device 14.

[0079] Therefore, the second gap 90 is set to a dimension that corresponds to the elastic range of the support roller 62. In other words, the second gap 90 is set to a dimension that allows the second impact receiving portion 66 to abut against the protrusion 88 before the support roller 62 exceeds the elastic range and undergoes plastic deformation. As an example, the same roller as the cam roller 54 (see FIG. 13) is used for the support roller 62, and the dimension of the second gap 90 corresponds to the dimension of the first gap 86. In other words, the dimension of the second gap 90 is set to the same dimension as the dimension of the first gap 86. The elastic range of the support roller 62 is an example of a "second elastic range" according to the technology of the present disclosure.

[0080] 18, when the width direction of the second impact receiving portion 66 is set to the direction along the circumferential direction of the second lens frame 26, at least a portion of the second impact receiving portion 66 in the width direction overlaps with at least a portion of the support roller 62 when viewed from the optical axis direction. In the present embodiment, as an example, a portion of the second impact receiving portion 66 in the width direction overlaps with a portion of the support roller 62 when viewed from the optical axis direction.

[0081] Note that the entire width of the second impact receiving portion 66 may overlap the entire support roller 62 when viewed from the optical axis direction, or the entire width of the second impact receiving portion 66 may overlap a portion of the support roller 62 when viewed from the optical axis direction. Also, a portion of the width of the second impact receiving portion 66 may overlap the entire support roller 62 when viewed from the optical axis direction.

[0082] Although one second impact receiving portion 66 is shown in FIG. 16, as shown in FIG. 19, the second lens frame 26 has a plurality of second impact receiving portions 66. A plurality of fixing portions 92 are formed on the image-side end portion 26A of the second lens frame 26. The plurality of fixing portions 92 are fixed to the imaging device body 12 (see FIG. 2). The number of the plurality of second impact receiving portions 66 is the same as the number of the plurality of fixing portions 92. As an example, the number of the plurality of second impact receiving portions 66 is four. The plurality of second impact receiving portions 66 are formed at equal intervals in the circumferential direction of the second lens frame 26.

[0083] Any one of the plurality of second impact receiving portions 66 (for example, four impact receiving portions) is provided at a position corresponding to any one of the plurality of support rollers 62 (for example, three support rollers 62). That is, as described above, at least a portion of the width direction of any one of the second impact receiving portions 66 overlaps with at least a portion of the support roller 62 when viewed from the optical axis direction (see FIG. 18 ).

[0084] Furthermore, at least a portion of the second impact bearing portion 66 in the width direction overlaps with at least a portion of the fixing portion 92 in the direction around the optical axis. In the present embodiment, as an example, a portion of the second impact bearing portion 66 in the width direction overlaps with a portion of the fixing portion 92 in the direction around the optical axis.

[0085] The entire width of the second impact receiving portion 66 may overlap with the entire fixed portion 92 in the direction around the optical axis, or the entire width of the second impact receiving portion 66 may overlap with a part of the fixed portion 92 in the direction around the optical axis. Also, a part of the width of the second impact receiving portion 66 may overlap with the entire fixed portion 92 in the direction around the optical axis.

[0086] 20, any one of the plurality of second impact receiving portions 66 (for example, four impact receiving portions) is provided at a position corresponding to any one of the plurality of first impact receiving portions 64 (for example, three impact receiving portions) described above. In other words, any one of the second impact receiving portions 66 is provided at the same position as any one of the first impact receiving portions 64 in the direction around the optical axis.

[0087] (effect) As described above in detail, in the lens device 14 according to this embodiment, the movable barrel 20 has the first impact receiving portion 64 that faces the side wall portion 78 of the cam groove 48 across the first gap 86 in the optical axis direction (see FIG. 13 ). The cam roller 54 is made of an elastic material. The first gap 86 corresponds to the elastic range of the cam roller 54. Therefore, when an impact is applied to the lens device 14, for example, by dropping the imaging device 10, causing the movable barrel 20 to move toward the imaging side and the cam roller 54 to elastically deform, the first impact receiving portion 64 abuts against the side wall portion 78 of the cam groove 48. This prevents the cam roller 54 from being plastically deformed beyond its elastic range, thereby preventing a decrease in the rotational accuracy of the cam barrel 36 and, ultimately, the linear movement accuracy of the movable barrel 20. As a result, a decrease in the optical performance of the lens device 14 can be prevented.

[0088] Furthermore, the opposing portion that faces the first impact bearing portion 64 across the first gap 86 in the optical axis direction is the side wall portion 78 of the cam groove 48 (see FIG. 13). Therefore, the structure of the lens device 14 can be simplified compared to, for example, a case in which the opposing portion is provided somewhere other than the side wall portion 78 of the cam groove 48.

[0089] Furthermore, at least a portion of the first impact force receiving portion 64 in the width direction overlaps with at least a portion of the cam roller 54 when viewed from the optical axis direction (see FIG. 12). Therefore, for example, compared to when the first impact force receiving portion 64 is offset from the cam roller 54 without overlapping it when viewed from the optical axis direction, the first impact force receiving portion 64 can receive an impact at a position closer to the cam roller 54. This can enhance the effect of suppressing plastic deformation of the cam roller 54 beyond its elastic range.

[0090] Furthermore, the movable barrel 20 has a plurality of cam roller members 50 and a plurality of first impact receiving portions 64, and each first impact receiving portion 64 is provided at a position corresponding to each cam roller 54 (see FIG. 11). Therefore, impacts can be received by each first impact receiving portion 64 corresponding to each cam roller 54. This enhances the effect of suppressing plastic deformation of each cam roller 54 beyond its elastic range, compared to when each first impact receiving portion 64 is provided without corresponding to any cam roller 54.

[0091] Furthermore, the linear roller 46 is disposed between the position of the center of gravity 68 of the first lens 28 and the cam roller 54 in the optical axis direction (see FIG. 5). Therefore, for example, compared to when the linear roller 46 is disposed in a position that is not between the position of the center of gravity 68 of the first lens 28 and the cam roller 54, it is possible to reduce the moment that acts on the linear roller 46 and that acts around the center of gravity 68 of the first lens 28 in a direction perpendicular to the optical axis direction. This makes it possible to suppress damage to the linear roller 46.

[0092] Furthermore, the rotating barrel 22 has a cam barrel 36 having a cam groove 48, and a connecting barrel 38 arranged on the imaging side of the cam barrel 36 (see FIG. 7). The connecting barrel 38 is configured separately from the cam barrel 36 and is connected to the cam barrel 36. Therefore, the cam groove 48 can be formed by cutting before the cam barrel 36 is assembled to the connecting barrel 38. This makes it possible to form the cam groove 48 up to a position closer to the end of the cam barrel 36 on the connecting barrel 38 side, compared to when the cam barrel 36 is formed integrally with the connecting barrel 38. As a result, it is possible to prevent the cam barrel 36, and therefore the rotating barrel 22, from increasing in size in the optical axis direction.

[0093] The connecting barrel 38 also has a protrusion 88 that protrudes toward the imaging side, and the second lens frame 26 has a second impact receiving portion 66 that faces the protrusion 88 with a second gap 90 in the optical axis direction (see FIG. 16 ). The fixed barrel 18 has support rollers 62 that engage with support grooves 56 formed in the connecting barrel 38, and the support rollers 62 are made of an elastic material. The second gap 90 corresponds to the elastic range of the support rollers 62. Therefore, when an impact is applied to the lens device 14, such as when the imaging device 10 is dropped, causing the movable barrel 20 and the rotatable barrel 22 to move toward the imaging side and the support rollers 62 to elastically deform, the protrusions 88 come into contact with the second impact receiving portion 66. This prevents the support rollers 62 from being plastically deformed beyond their elastic range, thereby preventing a decrease in the rotational accuracy of the cam barrel 36 and, ultimately, the linear movement accuracy of the movable barrel 20. As a result, a decrease in the optical performance of the lens device 14 is prevented.

[0094] Furthermore, the second lens frame 26 has a fixed portion 66 that is fixed to the imaging device body 12, and at least a portion of the second impact bearing portion 66 in the width direction overlaps with at least a portion of the fixed portion 92 in the direction around the optical axis (see FIG. 19 ). Therefore, compared to, for example, a case where the second impact bearing portion 66 is shifted from the fixed portion 92 without overlapping it, the second impact bearing portion 66 can absorb an impact at a position closer to the fixed portion 92. This can enhance the effect of suppressing plastic deformation of the support roller 62 beyond its elastic range.

[0095] Furthermore, the fixed barrel 18 has a plurality of support rollers 62 (for example, three support rollers 62), and the second lens frame 26 has a plurality of second impact receiving portions 66 (for example, four impact receiving portions). Any one of the plurality of second impact receiving portions 66 is provided at a position corresponding to any one of the plurality of support rollers 62 (see FIG. 18 ). Therefore, compared to, for example, a case where each second impact receiving portion 66 is provided without corresponding to any one of the support rollers 62, it is possible to more effectively prevent any one of the support rollers 62 from being plastically deformed beyond its elastic range.

[0096] Furthermore, any one of the plurality of second impact receiving portions 66 (four impact receiving portions, as an example) is provided at a position corresponding to any one of the plurality of first impact receiving portions 64 (three impact receiving portions, as an example) (see FIG. 20). This makes it possible to improve the effect of suppressing plastic deformation of the cam roller 54 corresponding to any one first impact receiving portion 64 and the support roller 62 corresponding to any one second impact receiving portion 66 beyond their respective elastic ranges, compared to, for example, a case where each second impact receiving portion 66 is provided without corresponding to any one first impact receiving portion 64.

[0097] (Variation) In the above embodiment, the number of the second impact receiving portions 66 may be the same as the number of the support rollers 62. Each second impact receiving portion 66 may be provided at a position corresponding to each support roller 62. In this way, impacts can be received by each second impact receiving portion 66 corresponding to each support roller 62. This can enhance the effect of suppressing plastic deformation of each support roller 62 beyond its elastic range, compared to when each second impact receiving portion 66 is provided without corresponding to any support roller 62.

[0098] 21, the number of the second impact receiving portions 66 may be the same as the number of the first impact receiving portions 64. Each second impact receiving portion 66 may be provided at a position corresponding to a corresponding first impact receiving portion 64. In this way, compared to, for example, a case where each second impact receiving portion 66 is provided without corresponding to any first impact receiving portion 64, it is possible to improve the effect of suppressing plastic deformation of the cam roller 54 corresponding to each first impact receiving portion 64 and the support roller 62 corresponding to each second impact receiving portion 66 beyond their respective elastic ranges.

[0099] The above-described description and illustrations are a detailed explanation of the parts related to the technology of the present disclosure and are merely an example of the technology of the present disclosure. For example, the above description of the configuration, functions, actions, and effects is an explanation of an example of the configuration, functions, actions, and effects of the parts related to the technology of the present disclosure. Therefore, it goes without saying that unnecessary parts may be deleted, new elements may be added, or replacements may be made to the above-described description and illustrations within the scope of the gist of the technology of the present disclosure. Furthermore, to avoid confusion and facilitate understanding of the parts related to the technology of the present disclosure, the above-described description and illustrations omit explanations of common technical knowledge that do not require particular explanation to enable the implementation of the technology of the present disclosure. [Explanation of symbols]

[0100] 10. Imaging device 12 Imaging device body 14 Lens device 16 Image Sensors 18 Fixed tube 20 Moving Cylinder 22 Rotating Cylinder 24 First lens frame 26 Second lens frame 28 First lens 30 Second lens 32 Drive unit 34 Fixed part 36 Cam barrel 38 Connecting tube 40 Straight groove 42 Straight roller member 44 Shaft member 46 Straight roller 48 Cam groove 50 Cam roller member 52 Shaft member 54 Cam Roller 56 Support groove 58 Support roller member 60 Shaft member 62 Support roller 64 First impact receiving part 66 Second impact receiving part 66 Fixed part 68 Center of gravity 70 Battery 72 Hot shoe microphone 74 Finder 76 Tripod mount 78 Side wall 80 Gear section 82 First fitting part 84 Second fitting part 86 First Gap 88 Convex part 90 Second gap 92 Fixed part

Claims

1. a rotating barrel having a spiral cam groove; a first lens frame that holds a first lens; a movable barrel having a first engagement member that engages with the cam groove and that holds the first lens frame; a fixed barrel that supports the movable barrel so that the movable barrel can move along the optical axis; Equipped with the rotating cylinder has a first opposing portion, the movable barrel has a second opposing portion that faces the first opposing portion with a first gap in the optical axis direction, the first engagement member has a first elastic region; The first gap is a gap corresponding to the first elastic region. Lens device.

2. a deformation amount of the first engaging member in the direction of the optical axis, the deformation amount corresponding to the yield point of the first engaging member being A [mm], and a dimension of the first gap in the direction of the optical axis being B [mm], the deformation amount satisfies Equation (1). B < A... (1) The lens device according to claim 1 .

3. Satisfying formula (2), A×0.7≦B<A...(2) The lens device according to claim 2 .

4. B=0.050 mm; The lens device according to claim 3 .

5. the first gap is a gap where the second opposing portion abuts against the first opposing portion before the first engagement member exceeds the first elastic region and is plastically deformed; The lens device according to claim 1 .

6. the first engagement member is a roller of a cam follower; The lens device according to claim 1 .

7. The material of the first engagement member is a material including resin, rubber, or elastomer. The lens device according to claim 1 .

8. the first engagement member is a cam follower roller selected according to the width of the cam groove; The lens device according to claim 1 .

9. The first opposing portion is formed on a side wall portion of the cam groove. The lens device according to claim 1 .

10. the second opposing portion is located on a subject side of the side wall portion in the direction of the optical axis; The lens device according to claim 9 .

11. At least a portion of the second opposing portion overlaps with at least a portion of the first engaging member when viewed from the optical axis direction. The lens device according to claim 1 .

12. The movable cylinder is A plurality of the first engagement members; A plurality of the second opposing portions; and Each of the second opposing portions is provided at a position corresponding to each of the first engaging members. The lens device according to claim 1 .

13. The number of the second opposing portions is the same as the number of the first engaging members. The lens device according to claim 12.

14. The rotating cylinder is a cam barrel having the cam groove; a connecting tube disposed on the imaging side of the cam tube; and an end portion of the movable barrel on the image forming side is located radially outward of the cam barrel, The second opposing portion is provided in a convex shape on the inner circumferential surface of the end portion. The lens device according to claim 1 .

15. the fixed barrel has a rectilinear groove aligned with the optical axis direction, the movable barrel has a second engagement member that engages with the rectilinear groove, the second engagement member is disposed between the center of gravity of the first lens and the first engagement member in the direction of the optical axis; The lens device according to claim 1 .

16. The rotating cylinder is a cam barrel having the cam groove; a connecting tube disposed on the imaging side of the cam tube; and The connecting cylinder is configured separately from the cam cylinder and is connected to the cam cylinder. The lens device according to claim 1 .

17. The connecting cylinder has a gear portion that engages with the drive portion. The lens device of claim 16.

18. The gear portion is formed on the end portion of the connecting tube on the imaging side.

18. The lens device of claim 17.

19. The connecting tube has a shape in which the diameter increases toward the image forming side. The lens device of claim 16.

20. The outer diameter of the end of the connecting tube on the imaging side is larger than the outer diameter of the cam tube. The lens device of claim 16.

21. a second lens frame that holds a second lens; The second lens is a third lens located radially inside the cam barrel; a fourth lens located radially inside the connecting tube; and The outer diameter of the fourth lens is larger than the outer diameter of the third lens. The lens device of claim 16.

22. the cam barrel is made of a material containing metal; The lens device of claim 16.

23. a second lens frame that holds a second lens; the rotary barrel has a support groove extending along a direction around the optical axis, the fixed barrel has a third engaging member that engages with the support groove, the rotating cylinder has a third opposing portion, the second lens frame has a fourth opposing portion that faces the third opposing portion with a second gap in the optical axis direction, the third engagement member has a second elastic region; The second gap is a gap corresponding to the second elastic region. The lens device according to claim 1 .

24. The second gap is a gap corresponding to the first gap.

24. The lens device of claim 23.

25. the second lens frame has a fixing portion that is fixed to the imaging device body, At least a portion of the fourth opposing portion overlaps with at least a portion of the fixed portion in the direction around the optical axis.

24. The lens device of claim 23.

26. the fixed barrel has a plurality of the third engagement members, the second lens frame has a plurality of the fourth opposing portions, At least one of the plurality of fourth opposing portions is provided at a position corresponding to at least one of the plurality of third engaging members.

24. The lens device of claim 23.

27. the movable barrel has a plurality of the second opposing portions, the second lens frame has a plurality of the fourth opposing portions, At least one of the plurality of fourth opposing portions is provided at a position corresponding to at least one of the plurality of second opposing portions.

24. The lens device of claim 23.

28. An imaging device comprising the lens device according to claim 1.

Images